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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_simple.c Simple example of an action
4 *
5 * Authors: Jamal Hadi Salim (2005-8)
6 */
7
8#include <linux/module.h>
9#include <linux/slab.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <net/netlink.h>
15#include <net/pkt_sched.h>
16#include <net/pkt_cls.h>
17
18#include <linux/tc_act/tc_defact.h>
19#include <net/tc_act/tc_defact.h>
20
21static unsigned int simp_net_id;
22static struct tc_action_ops act_simp_ops;
23
24#define SIMP_MAX_DATA 32
25static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a,
26 struct tcf_result *res)
27{
28 struct tcf_defact *d = to_defact(a);
29
30 spin_lock(&d->tcf_lock);
31 tcf_lastuse_update(&d->tcf_tm);
32 bstats_update(&d->tcf_bstats, skb);
33
34 /* print policy string followed by _ then packet count
35 * Example if this was the 3rd packet and the string was "hello"
36 * then it would look like "hello_3" (without quotes)
37 */
38 pr_info("simple: %s_%d\n",
39 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
40 spin_unlock(&d->tcf_lock);
41 return d->tcf_action;
42}
43
44static void tcf_simp_release(struct tc_action *a)
45{
46 struct tcf_defact *d = to_defact(a);
47 kfree(d->tcfd_defdata);
48}
49
50static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
51{
52 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
53 if (unlikely(!d->tcfd_defdata))
54 return -ENOMEM;
55 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
56 return 0;
57}
58
59static int reset_policy(struct tc_action *a, const struct nlattr *defdata,
60 struct tc_defact *p, struct tcf_proto *tp,
61 struct netlink_ext_ack *extack)
62{
63 struct tcf_chain *goto_ch = NULL;
64 struct tcf_defact *d;
65 int err;
66
67 err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack);
68 if (err < 0)
69 return err;
70 d = to_defact(a);
71 spin_lock_bh(&d->tcf_lock);
72 goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch);
73 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
74 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
75 spin_unlock_bh(&d->tcf_lock);
76 if (goto_ch)
77 tcf_chain_put_by_act(goto_ch);
78 return 0;
79}
80
81static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
82 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
83 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
84};
85
86static int tcf_simp_init(struct net *net, struct nlattr *nla,
87 struct nlattr *est, struct tc_action **a,
88 int ovr, int bind, bool rtnl_held,
89 struct tcf_proto *tp, struct netlink_ext_ack *extack)
90{
91 struct tc_action_net *tn = net_generic(net, simp_net_id);
92 struct nlattr *tb[TCA_DEF_MAX + 1];
93 struct tcf_chain *goto_ch = NULL;
94 struct tc_defact *parm;
95 struct tcf_defact *d;
96 bool exists = false;
97 int ret = 0, err;
98 u32 index;
99
100 if (nla == NULL)
101 return -EINVAL;
102
103 err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy,
104 NULL);
105 if (err < 0)
106 return err;
107
108 if (tb[TCA_DEF_PARMS] == NULL)
109 return -EINVAL;
110
111 parm = nla_data(tb[TCA_DEF_PARMS]);
112 index = parm->index;
113 err = tcf_idr_check_alloc(tn, &index, a, bind);
114 if (err < 0)
115 return err;
116 exists = err;
117 if (exists && bind)
118 return 0;
119
120 if (tb[TCA_DEF_DATA] == NULL) {
121 if (exists)
122 tcf_idr_release(*a, bind);
123 else
124 tcf_idr_cleanup(tn, index);
125 return -EINVAL;
126 }
127
128 if (!exists) {
129 ret = tcf_idr_create(tn, index, est, a,
130 &act_simp_ops, bind, false);
131 if (ret) {
132 tcf_idr_cleanup(tn, index);
133 return ret;
134 }
135
136 d = to_defact(*a);
137 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
138 extack);
139 if (err < 0)
140 goto release_idr;
141
142 err = alloc_defdata(d, tb[TCA_DEF_DATA]);
143 if (err < 0)
144 goto put_chain;
145
146 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
147 ret = ACT_P_CREATED;
148 } else {
149 if (!ovr) {
150 err = -EEXIST;
151 goto release_idr;
152 }
153
154 err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack);
155 if (err)
156 goto release_idr;
157 }
158
159 if (ret == ACT_P_CREATED)
160 tcf_idr_insert(tn, *a);
161 return ret;
162put_chain:
163 if (goto_ch)
164 tcf_chain_put_by_act(goto_ch);
165release_idr:
166 tcf_idr_release(*a, bind);
167 return err;
168}
169
170static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
171 int bind, int ref)
172{
173 unsigned char *b = skb_tail_pointer(skb);
174 struct tcf_defact *d = to_defact(a);
175 struct tc_defact opt = {
176 .index = d->tcf_index,
177 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
178 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
179 };
180 struct tcf_t t;
181
182 spin_lock_bh(&d->tcf_lock);
183 opt.action = d->tcf_action;
184 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
185 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
186 goto nla_put_failure;
187
188 tcf_tm_dump(&t, &d->tcf_tm);
189 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
190 goto nla_put_failure;
191 spin_unlock_bh(&d->tcf_lock);
192
193 return skb->len;
194
195nla_put_failure:
196 spin_unlock_bh(&d->tcf_lock);
197 nlmsg_trim(skb, b);
198 return -1;
199}
200
201static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
202 struct netlink_callback *cb, int type,
203 const struct tc_action_ops *ops,
204 struct netlink_ext_ack *extack)
205{
206 struct tc_action_net *tn = net_generic(net, simp_net_id);
207
208 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
209}
210
211static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
212{
213 struct tc_action_net *tn = net_generic(net, simp_net_id);
214
215 return tcf_idr_search(tn, a, index);
216}
217
218static struct tc_action_ops act_simp_ops = {
219 .kind = "simple",
220 .id = TCA_ID_SIMP,
221 .owner = THIS_MODULE,
222 .act = tcf_simp_act,
223 .dump = tcf_simp_dump,
224 .cleanup = tcf_simp_release,
225 .init = tcf_simp_init,
226 .walk = tcf_simp_walker,
227 .lookup = tcf_simp_search,
228 .size = sizeof(struct tcf_defact),
229};
230
231static __net_init int simp_init_net(struct net *net)
232{
233 struct tc_action_net *tn = net_generic(net, simp_net_id);
234
235 return tc_action_net_init(net, tn, &act_simp_ops);
236}
237
238static void __net_exit simp_exit_net(struct list_head *net_list)
239{
240 tc_action_net_exit(net_list, simp_net_id);
241}
242
243static struct pernet_operations simp_net_ops = {
244 .init = simp_init_net,
245 .exit_batch = simp_exit_net,
246 .id = &simp_net_id,
247 .size = sizeof(struct tc_action_net),
248};
249
250MODULE_AUTHOR("Jamal Hadi Salim(2005)");
251MODULE_DESCRIPTION("Simple example action");
252MODULE_LICENSE("GPL");
253
254static int __init simp_init_module(void)
255{
256 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
257 if (!ret)
258 pr_info("Simple TC action Loaded\n");
259 return ret;
260}
261
262static void __exit simp_cleanup_module(void)
263{
264 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
265}
266
267module_init(simp_init_module);
268module_exit(simp_cleanup_module);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_simple.c Simple example of an action
4 *
5 * Authors: Jamal Hadi Salim (2005-8)
6 */
7
8#include <linux/module.h>
9#include <linux/slab.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <net/netlink.h>
15#include <net/pkt_sched.h>
16#include <net/pkt_cls.h>
17#include <net/tc_wrapper.h>
18
19#include <linux/tc_act/tc_defact.h>
20#include <net/tc_act/tc_defact.h>
21
22static struct tc_action_ops act_simp_ops;
23
24#define SIMP_MAX_DATA 32
25TC_INDIRECT_SCOPE int tcf_simp_act(struct sk_buff *skb,
26 const struct tc_action *a,
27 struct tcf_result *res)
28{
29 struct tcf_defact *d = to_defact(a);
30
31 spin_lock(&d->tcf_lock);
32 tcf_lastuse_update(&d->tcf_tm);
33 bstats_update(&d->tcf_bstats, skb);
34
35 /* print policy string followed by _ then packet count
36 * Example if this was the 3rd packet and the string was "hello"
37 * then it would look like "hello_3" (without quotes)
38 */
39 pr_info("simple: %s_%llu\n",
40 (char *)d->tcfd_defdata,
41 u64_stats_read(&d->tcf_bstats.packets));
42 spin_unlock(&d->tcf_lock);
43 return d->tcf_action;
44}
45
46static void tcf_simp_release(struct tc_action *a)
47{
48 struct tcf_defact *d = to_defact(a);
49 kfree(d->tcfd_defdata);
50}
51
52static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
53{
54 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
55 if (unlikely(!d->tcfd_defdata))
56 return -ENOMEM;
57 nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
58 return 0;
59}
60
61static int reset_policy(struct tc_action *a, const struct nlattr *defdata,
62 struct tc_defact *p, struct tcf_proto *tp,
63 struct netlink_ext_ack *extack)
64{
65 struct tcf_chain *goto_ch = NULL;
66 struct tcf_defact *d;
67 int err;
68
69 err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack);
70 if (err < 0)
71 return err;
72 d = to_defact(a);
73 spin_lock_bh(&d->tcf_lock);
74 goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch);
75 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
76 nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
77 spin_unlock_bh(&d->tcf_lock);
78 if (goto_ch)
79 tcf_chain_put_by_act(goto_ch);
80 return 0;
81}
82
83static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
84 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
85 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
86};
87
88static int tcf_simp_init(struct net *net, struct nlattr *nla,
89 struct nlattr *est, struct tc_action **a,
90 struct tcf_proto *tp, u32 flags,
91 struct netlink_ext_ack *extack)
92{
93 struct tc_action_net *tn = net_generic(net, act_simp_ops.net_id);
94 bool bind = flags & TCA_ACT_FLAGS_BIND;
95 struct nlattr *tb[TCA_DEF_MAX + 1];
96 struct tcf_chain *goto_ch = NULL;
97 struct tc_defact *parm;
98 struct tcf_defact *d;
99 bool exists = false;
100 int ret = 0, err;
101 u32 index;
102
103 if (nla == NULL)
104 return -EINVAL;
105
106 err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy,
107 NULL);
108 if (err < 0)
109 return err;
110
111 if (tb[TCA_DEF_PARMS] == NULL)
112 return -EINVAL;
113
114 parm = nla_data(tb[TCA_DEF_PARMS]);
115 index = parm->index;
116 err = tcf_idr_check_alloc(tn, &index, a, bind);
117 if (err < 0)
118 return err;
119 exists = err;
120 if (exists && bind)
121 return ACT_P_BOUND;
122
123 if (tb[TCA_DEF_DATA] == NULL) {
124 if (exists)
125 tcf_idr_release(*a, bind);
126 else
127 tcf_idr_cleanup(tn, index);
128 return -EINVAL;
129 }
130
131 if (!exists) {
132 ret = tcf_idr_create(tn, index, est, a,
133 &act_simp_ops, bind, false, flags);
134 if (ret) {
135 tcf_idr_cleanup(tn, index);
136 return ret;
137 }
138
139 d = to_defact(*a);
140 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
141 extack);
142 if (err < 0)
143 goto release_idr;
144
145 err = alloc_defdata(d, tb[TCA_DEF_DATA]);
146 if (err < 0)
147 goto put_chain;
148
149 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
150 ret = ACT_P_CREATED;
151 } else {
152 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
153 err = -EEXIST;
154 goto release_idr;
155 }
156
157 err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack);
158 if (err)
159 goto release_idr;
160 }
161
162 return ret;
163put_chain:
164 if (goto_ch)
165 tcf_chain_put_by_act(goto_ch);
166release_idr:
167 tcf_idr_release(*a, bind);
168 return err;
169}
170
171static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
172 int bind, int ref)
173{
174 unsigned char *b = skb_tail_pointer(skb);
175 struct tcf_defact *d = to_defact(a);
176 struct tc_defact opt = {
177 .index = d->tcf_index,
178 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
179 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
180 };
181 struct tcf_t t;
182
183 spin_lock_bh(&d->tcf_lock);
184 opt.action = d->tcf_action;
185 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
186 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
187 goto nla_put_failure;
188
189 tcf_tm_dump(&t, &d->tcf_tm);
190 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
191 goto nla_put_failure;
192 spin_unlock_bh(&d->tcf_lock);
193
194 return skb->len;
195
196nla_put_failure:
197 spin_unlock_bh(&d->tcf_lock);
198 nlmsg_trim(skb, b);
199 return -1;
200}
201
202static struct tc_action_ops act_simp_ops = {
203 .kind = "simple",
204 .id = TCA_ID_SIMP,
205 .owner = THIS_MODULE,
206 .act = tcf_simp_act,
207 .dump = tcf_simp_dump,
208 .cleanup = tcf_simp_release,
209 .init = tcf_simp_init,
210 .size = sizeof(struct tcf_defact),
211};
212
213static __net_init int simp_init_net(struct net *net)
214{
215 struct tc_action_net *tn = net_generic(net, act_simp_ops.net_id);
216
217 return tc_action_net_init(net, tn, &act_simp_ops);
218}
219
220static void __net_exit simp_exit_net(struct list_head *net_list)
221{
222 tc_action_net_exit(net_list, act_simp_ops.net_id);
223}
224
225static struct pernet_operations simp_net_ops = {
226 .init = simp_init_net,
227 .exit_batch = simp_exit_net,
228 .id = &act_simp_ops.net_id,
229 .size = sizeof(struct tc_action_net),
230};
231
232MODULE_AUTHOR("Jamal Hadi Salim(2005)");
233MODULE_DESCRIPTION("Simple example action");
234MODULE_LICENSE("GPL");
235
236static int __init simp_init_module(void)
237{
238 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
239 if (!ret)
240 pr_info("Simple TC action Loaded\n");
241 return ret;
242}
243
244static void __exit simp_cleanup_module(void)
245{
246 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
247}
248
249module_init(simp_init_module);
250module_exit(simp_cleanup_module);